Translating a tag
Go to the administration interface, 'Tags' tab.
Search for the tag you want to translate.
Click on 'Change'.
Perform the translation and save.
Translating a category
Translating category names is also done from the administration interface. Either individually by editing the properties of the category or grouped from the translation file.
Translating several tags and categories
Go to the administration interface, 'Categories' tab.
Click on 'Load translations'.
Download the translation file.
The Excel file consists of two sheets: one dedicated to categories, the other to tags.
Edit the column and take care that you do not change the ID columns corresponding to the user name of the tag or category.
Once the file has been saved, go back to the window to load the translation file.